The Carbon Cycle Greenhouse Gases (CCGG) research area operates the Global Greenhouse Gas Reference Network, measuring the atmospheric distribution and trends of the three main long-term drivers of climate change, carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O), as well as carbon monoxide (CO) which is an important indicator of air pollution.
        


7.3 DATA - FILE TYPE

We now provide some NOAA Global Monitoring Division measurements
in two unique file formats (netCDF and ASCII text). The Network
Common Data Form (NetCDF) is a self-describing, machine-independent
data format that supports creation, access, and sharing of array-oriented
scientific data.  To learn more about netCDF and how to read netCDF
files, please visit http://www.unidata.ucar.edu. 

The ASCII text file is derived directly from the netCDF file.  The
text file is also self-describing and can be viewed using any text
editor.  "Self-describing" means the file includes enough information
about the included data (called metadata) that no additional file is 
required to understand the structure of the data and how to read and 
use the data.

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7.4 DATA - CONTENT

For each observatory record we provide an hourly, daily, and monthly
average file.  Daily averages are derived directly from the hourly data.
Monthly averages are derived from the daily averages.  Higher resolution
data (sub-hourly) are available upon request.


All (ASCII text and netCDF) files are located in 
"ftp://aftp.cmdl.noaa.gov/data/trace_gases/co2/in-situ/surface/[site]/".

Files are named as follows (see Section 7.2 for details):

     co2_[site]_surface-insitu_1_ccgg_HourlyData.[file type]
     co2_[site]_surface-insitu_1_ccgg_DailyData.[file type]
     co2_[site]_surface-insitu_1_ccgg_MonthlyData.[filetype]

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